Hi, here I'm going to share how to use add a custom thread field for users to upload MP3 files that users can play in threads.

For this tutorial, a single custom thread field is necessary.

xThreads Field
Next step would be us creating and configuring our xThreads field. We are going to create a file field using the following details:

1. Key: `files_audio_mp3`
   
2. Input Field Type: `File`
   
3. Valid File Extensions: `mp3`
   
4. Maximum File Size: `5000000` for 5 Megabytes
   
5. Allow multiple values for this field: `Yes` It is advised to never change this setting once the field is created.
   
6. Maximum Number of Values: `10` Maximum number of files to be allowed to be uploaded. Can be changed after creating the field.
   
7. Multiple Value Delimiter: `(space)`
   
8. Display Item Format:
   Code:

   <audio controls>
    <source src="{URL}" type="audio/mpeg">
    Your browser does not support the audio element.
</audio>
   
9. Save the field.
   

Any option not mentioned is to be configured as you see fit.